I spoke with my SO who's living in Japan about this, and she showed some interest in shipping Keirin frames to US (not to make a profit, but just to help out people who are into track/fixie). I'll be in Japan this summer and I will do some research on what the used Keirin frame market is like, and probably buy one or two frames for myself. I don't know much about Keirin or track frames and what to look for, so that's something I need to learn. But if everything goes smoothly this summer, we might start a small scale "operation". We'll see...